DIHOOL 300A DC Battery Disconnect Switch – Heavy Duty 12–400V Thermal-Magnetic Breaker, Front-Access

DIHOOL's Heavy Duty Battery Disconnect Switch is a 300 amp DC thermal-magnetic circuit breaker designed to protect and isolate 12–400V battery, solar and power station systems.

This compact, front-accessible unit combines overload and short-circuit protection with an easy-to-install isolation switch for photovoltaic arrays, UPS racks, battery banks and data center power setups. Built for DC applications, the DIHOOL breaker delivers dependable trip performance across two voltage modes (12–30V without short-circuit protection and 32–400V with short-circuit protection) and fits into constrained compartments where serviceability matters.

How does this breaker protect my battery and solar system?

The DIHOOL device uses a thermal-magnetic trip mechanism that responds to both prolonged overload and sudden short-circuit conditions. Thermal elements handle slow, sustained overcurrents while the magnetic portion reacts instantly to high fault currents, reducing equipment damage and fire risk when used as part of a properly designed DC system.

• 300 A continuous rating for heavy battery banks and inverter feeds
• Thermal trip for overloads, magnetic trip for short, fast faults
• Appropriate for DC photovoltaic, UPS and battery installations
• State changes provide clear isolation for maintenance

What voltages and applications is it suitable for?

This breaker supports two voltage ranges: 12–30V operation without integrated short-circuit protection, and 32–400V operation including short-circuit protection. That flexibility makes it appropriate for off-grid solar arrays, power stations, data center DC buses and battery backup systems where voltage ranges vary by design.

• 12–30 VDC mode for lower-voltage battery strings (no short-circuit feature)
• 32–400 VDC mode with short-circuit protection for higher-voltage systems
• Commonly used with photovoltaic arrays, UPS systems, and DC distribution
• Front-accessible installation for enclosed compartments

How large is the unit and how easy is it to install?

The DIHOOL breaker measures 73 mm x 163 mm x 86 mm and is designed for front-access mounting so you can reach controls and wiring without removing cabinetry panels. Terminals and mounting points are arranged to simplify integration into battery boxes, power racks or solar combiner enclosures.

• Compact footprint fits tight compartments and rack spaces
• Front access speeds routine inspection and replacement
• Clear terminal layout reduces installation time and wiring errors
• Robust housing suited to industrial and residential power systems

What maintenance and operational features should I expect?

The breaker offers repeatable manual isolation for safe servicing and resets after trip events in line with thermal-magnetic behavior. Regular visual inspections and correct torque on terminals are recommended to ensure reliable contact and thermal performance over time.

• Manual disconnect function for safe maintenance isolation
• Repeatable reset capability following a trip event
• Simple front access for quick condition checks and servicing
• Recommended periodic terminal torque checks and visual inspections

Who is this for: Technicians, installers and system integrators working on off-grid solar arrays, power station builds, battery backup systems, UPS installations and data center DC distribution will benefit from DIHOOL's 300A thermal-magnetic disconnect switch. It fits projects that require a heavy-duty, compact breaker offering clear isolation, reliable overload and fault response, and front-access convenience for enclosed electrical compartments.